Preheat oven to 350 degrees F (175 degrees C).

Place cauliflower in a steamer over 1 inch of boiling water, and cover. Cook until tender but still firm. Drain, and place in a greased casserole dish.

In a large bowl, mix together soup, mayonnaise, milk, and curry powder. Pour over cauliflower. Crush crackers, and mix with butter. Sprinkle over cauliflower.

Bake in preheated oven for 30 minutes.